i would STAY AWAY from double digits! not needed, wanted, or appreciated, by our charges. i was using the foxfarm regime. i did ok. nice sized colas. but near impossible to flush as good as i liked, and, often the plants would tell me, "slow down the nutes!" lol. currently i am on my second crop, of canna vega for veg, and flora nova for bloom. both are one parters, and both have low numbers. the plants really like this stuff. i think they are doing better, than if i were douching them with ferts. lol. i may add one additvce to the flora nova, justs to see....oh. flora nova is by gp. read up on it. good stuff.